Document: draft-ietf-bfd-stability Title: BFD Stability Reviewer: Gyan Mishra Review result: Not Ready
Summary: This document describes extensions to the Bidirectional Forwarding Detection (BFD) protocol to measure BFD stability. Specifically, it describes a mechanism for detection of BFD packet loss. Major issues: None Minor issues: Section 7 describes the stability Yang model. It references RFC 9314 BGP Yang model for lacp, lag, sh, mh, mpls but does not mention SR-MPLS or SRv6 which should be included as data planes stability that should be supported with this draft. Section 6.2 talks about out of order packet. I wonder if with the null authentication header with the sequence number counter that could be used for sequencing and ordering of packets over lag or ECMP. As BFD control packets are not stateful as is with TCP as long as packet is received on far end it does not matter what path is taken. I agree out of order packets are not lost packets as long as the BFD packet is received by far end. In case of lag with lacp bundle with BFD over bundle member, there is a micro BFD session on each bundle member. For ECMP it’s a single BFD session across all paths if S-BGD is used and if running IGP OSPF or ISIS as BFD registered client then a single BFD session exists between the ingress PE or VM compute node and egress PE or VM compute node. In that case their is no OOO BFD control plane. Nits: None
